It's a 1mm difference so it's only slight. I have no problem going between the two but all but one of my guitars are 1 11/16" and I prefer that. The primary difference I notice is fingering open chords (first fret) because the 1 5/8 is a little narrow for my fingers. If 1 5/8 is comfortable for you, you should have no problem with the 1 11/16.
Go to your local guitar store and your typical
Fender Strat is 1 11/16 so you can see how it feels to you.